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Three spheres each of radius R are fixed...

Three spheres each of radius R are fixed at three points such that their centre from an equilateral triangle of side 'd' the velocity with which a particle of mass m be projected from the midpoint of one of the sides of the triangle so that it escapes the gravitational field of the system is `sqrt(4GM(2sqrt(x+1)))/(dsqrtx)` each sphere has mass M find the value of x,

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